We have examined the ion scale break frequency of solar wind turbulence during intervals of β⊥i≪1 and β⊥i≫1.
Our data support the hypothesis that topoisomerase IIa expression is a determinant of chromatid break frequency in irradiated G2 cells, and thus could be an underlying cause of the observed variability of chromatid radiosensitivity among both sporadic breast cancer cases and normal control individuals.
Relations of DNA double-strand break frequency with telomere maintenance and ageing have been reported [ 9], [ 25], and the link between ageing and autoimmunity is also striking.
The break is also not at a fixed value of fsc: the mean break frequency is fb=0.58Hz in the low β⊥i intervals and fb=0.22Hz in the high β⊥i intervals, a factor of 2.6 different.
The average ratio of the measured break frequency fb to the theoretical break frequency for each scale f x is given, which is closest to unity in the β⊥i≪1 intervals for di and in the β⊥i≫1 intervals for ρi.
Cell-cycle arrest is a factor that could possibly influence observed frequencies of chromatid breaks, and at least one study of human tumour cell lines in vitro (Schwartz et al, 1996) reports an inverse relationship between mitotic inhibition and chromatid break frequency.
We define the likelihood for the process enabling us to estimate the parameters of the process, including break frequencies in the power spectral density.
A study published today in the Journal of the American Medical Association (JAMA) adds another benefit a lower risk of breaking a hip. the frequency of hip fracture was 16% lower among those who had cataract surgery compared with those who didn't have it.
"A higher frequency of breaks in sedentary time or sitting per day was associated with lower risk factors for cardiovascular disease and type 2 diabetes," says study author Valerie Carson, Ph.D., assistant professor of physical education and recreation at the university.
In Las Vegas casinos, for instance, hourly breaks are often built into shifts, because health research shows that a higher frequency of short breaks can be more beneficial than just one long break.
Chromatid break frequencies were compared for a cohort of previously untreated sporadic breast cancer patients and hospital outpatient controls.
